Sokka's Space Sword

During the Comic-Con, they showed a pretty long video of some
animation that they did for Book Two: Spirits. It features Bolin
pro-bending without Korra and Mako, and, well, the new Fire Ferrets
are horrible (besides Bolin). Mako is now some kind of cop, and it
shows him hunting some gang down. Asami took control of Future
Industries, but because of it's previous Equalist ties, nobody
wants to work with them, making them almost bankrupt. Korra isn't
taking her new Avatar powers seriously. Jinora, Ikki, Meelo, and
Korra all race on air scooters, but suddenly, Korra goes into the
Avatar state and leaves the three in the dust. Tenzin then scolds
her saying that she doesn't appreciate her new-found powers and
stuff.

If you missed the San-Diego Comic Con, don't worry! One user
from the website Reddit uploaded almost every single image from the
Korra panel, and, boy, this is really big news.

Go here to see almost everything from the Comic-Con in really
high quality, but trust me, there is a lot. And I mean a
lot. Your body won't be ready, trust me. Book 2 is also called
"Spirits," and there will be some new characters, such as Unalok,
Tonraq's brother. Bumi and Kya also play a big role. Korra, Mako,
Bolin, Asami, and Tenzin have an updated look, so be sure to check
that out.

By the way... they were selling these posters at the Comic-Con,
and yes, it's canon. Go ahead, you can scream.